CN109584819A - A kind of shutdown discharge circuit and liquid crystal display device - Google Patents
A kind of shutdown discharge circuit and liquid crystal display device Download PDFInfo
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- CN109584819A CN109584819A CN201811537826.6A CN201811537826A CN109584819A CN 109584819 A CN109584819 A CN 109584819A CN 201811537826 A CN201811537826 A CN 201811537826A CN 109584819 A CN109584819 A CN 109584819A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of shutdown discharge circuit and liquid crystal display devices, liquid crystal display device of the present invention passes through external shutdown discharge circuit, after liquid crystal display device power-off, voltage output can be carried out by the charge-discharge modules electric discharge for the discharge circuit that shuts down, the voltage of the grid signal input terminal of thin film transistor (TFT) in pixel unit is drawn high to high level voltage, so that thin film transistor (TFT) opens electric discharge in pixel unit, so that liquid crystal display device without power-off ghost shadow, solves the problems, such as to influence the display effect of display due to the film flicker caused by residual charge；And shutdown discharge circuit structure is simple.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of shutdown discharge circuits and liquid crystal display device.
Background technique
With the development of photoelectricity and semiconductor technology, liquid crystal display (Liquid Crystal Display, abbreviation LCD)
Also it is flourished.In many liquid crystal displays, Thin Film Transistor-LCD (Thin Film Transistor
Liquid Crystal Display, abbreviation TFT-LCD) there is high spatial utilization efficiency, low consumpting power, radiationless and low
The advantageous characteristics such as electromagnetic interference.TFT-LCD includes multiple pixel units, and each pixel unit has a thin film transistor (TFT)
(Thin Film Transistor, abbreviation TFT), the grid of the TFT is connected to horizontally extending scan line (Gate),
The drain electrode of the TFT is connected to the data line (Data) extended in the vertical direction, and the source electrode of the TFT is connected to corresponding pixel electricity
Hold.If applying enough positive voltages in certain scan line in the horizontal direction, can be connected in this scan line
All TFT are opened, by the voltage data signal writing pixel electrode loaded on data line, to show picture.
Currently, requirement of the people for liquid crystal display is continuously improved, especially to the display image quality of liquid crystal display panel
It is required that it is higher and higher, and power-off ghost shadow problem is to influence one of the key factor of image display quality.When liquid crystal display powers off
Afterwards, the TFT in liquid crystal display panel is closed, and pixel capacitance has little time to discharge or discharge not exclusively, and it is residual to be easy to appear shutdown
Shadow.If these charges can not exclude completely before activating liquid crystal display panel next time, after liquid crystal display being made to be again turned on,
There is of short duration flashing in liquid crystal display panel, and the image display quality of liquid crystal display panel is caused to decline.
Many machines exist due to reducing cost (Cost Down) at present, and the component chosen is caused not supported
Anti- power-off ghost shadow, or the phenomenon that lead to liquid crystal display due to design reasons there are power-off ghost shadows.
Therefore, how to pass through the simple outer residual charge taken circuit, realize after liquid crystal display powers off in release panel,
It solves the problems, such as the display effect for influencing display due to the film flicker caused by residual charge, is that LCD technology developed
Urgent problem to be solved in journey.
Summary of the invention
The object of the present invention is to provide a kind of shutdown discharge circuit and liquid crystal display devices, can be by simple
Circuit is taken outside, realizes that the residual charge discharged in panel after liquid crystal display powers off, picture caused by solving because of residual charge dodge
The problem of sparkling and influencing the display effect of display.
To achieve the above object, the present invention provides a kind of shutdown discharge circuits, comprising: switch control module, charge and discharge
Module and switching tube；The input terminal of the shutdown discharge circuit is electrically connected to high level voltage input terminal；The switch control
The first end of module is coupled to the input terminal of the shutdown discharge circuit, and its second end is electrically connected the of the charge-discharge modules
One end, the input terminal for being coupled to the switching tube simultaneously；The second end of the charge-discharge modules is grounded；The control of the switching tube
End is coupled to the input terminal of the shutdown discharge circuit, and its output end is shorted to the output end of the shutdown discharge circuit；When
When the high level voltage input terminal putting high level voltage, the switch control module conducting, the switching tube ends, described
The first end of charge-discharge modules receives the high level voltage by the switch control module and charges；When the high level
When voltage input end stops putting high level voltage, switch control module cut-off, the first ends of the charge-discharge modules to
The input terminal of the switching tube discharges, the switching tube conducting, so that the output end of the shutdown discharge circuit exports institute
State high level voltage.
To achieve the above object, the present invention also provides a kind of liquid crystal display device, the liquid crystal display device includes upper
State shutdown discharge circuit；The input terminal of the shutdown discharge circuit and the high level voltage input terminal electricity of the liquid crystal display device
Connection；The grid of thin film transistor (TFT) is believed in the output end of the shutdown discharge circuit and the pixel unit of the liquid crystal display device
Any one in one clock signal input terminal of the gate drivers of number input terminal and the liquid crystal display device corresponds to electricity
Connection.
The present invention has the advantages that liquid crystal display device of the present invention is filled by external shutdown discharge circuit in liquid crystal display
After setting power-off, voltage output can be carried out by the charge-discharge modules electric discharge for the discharge circuit that shuts down, draw high film in pixel unit
The voltage of the grid signal input terminal of transistor is to high level voltage, so that thin film transistor (TFT) opens electric discharge in pixel unit, from
And make liquid crystal display device without power-off ghost shadow, the display of display is influenced due to solving the film flicker caused by residual charge
The problem of effect；And shutdown discharge circuit structure is simple.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1, the architecture diagram of present invention shutdown discharge circuit first embodiment；
Fig. 2, the circuit diagram of present invention shutdown discharge circuit first embodiment；
Fig. 3, the architecture diagram of present invention shutdown discharge circuit second embodiment；
Fig. 4, the circuit diagram of present invention shutdown discharge circuit second embodiment；
Fig. 5, the architecture diagram of one embodiment of liquid crystal display device of the present invention；
Fig. 6 A, charge discharges schematic diagram after liquid crystal display device power-off of the present invention；
Fig. 6 B, charge discharges schematic diagram after liquid crystal display device power-off in the prior art.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
With reference to Fig. 1, the architecture diagram of present invention shutdown discharge circuit first embodiment.The shutdown discharge circuit 10 includes:
Switch control module 12, charge-discharge modules 13 and switching tube 14.
The input terminal 11 of the shutdown discharge circuit 10 is electrically connected to high level voltage input terminal 18；The switch control mould
The first end of block 12 is coupled to the input terminal 11 of the shutdown discharge circuit 10, and its second end is electrically connected the charge-discharge modules
13 first end, the input terminal for being coupled to the switching tube 14 simultaneously.The second end of the charge-discharge modules 13 is grounded (GND)；
The control terminal of the switching tube 14 is coupled to the input terminal 11 of the shutdown discharge circuit 10, and its output end is shorted to the pass
The output end 15 of machine discharge circuit 10.
As the 18 putting high level voltage VGH of high level voltage input terminal, the switch control module 12 is connected, institute
The cut-off of switching tube 14 is stated, the first end of the charge-discharge modules 13 receives the high level electricity by the switch control module 12
Pressure VGH charges.When the switch control module 12 is connected, the first end of the charge-discharge modules 13 is controlled by the switch
Molding block 12 receives the high level voltage VGH and charges, and charging voltage is equal to the high level voltage VGH；The switch
The input terminal voltage of pipe 14 is identical as its control terminal voltage, so cut-off；To the output end 15 of the shutdown discharge circuit 10
There is no voltage output.
When the high level voltage input terminal 18 stops putting high level voltage VGH, the switch control module 12 is cut
Only, the first end of the charge-discharge modules 13 is discharged to the input terminal of the switching tube 14, and the switching tube 14 is connected, and is made
The output end 15 for obtaining the shutdown discharge circuit 10 exports the high level voltage VGH.When the switch control module 12 ends,
The first end of the charge-discharge modules 13 is discharged to the input terminal of the switching tube 14, and discharge voltage is equal to the high level
Voltage VGH；The input terminal voltage of the switching tube 14 is greater than its control terminal voltage, so conducting, output end voltage is described
High level voltage VGH；To which the output end 15 of the shutdown discharge circuit 10 exports the high level voltage VGH, access other
Circuit provides short-duration power, draws high the voltage of the corresponding port of accessed circuit.
Present invention shutdown discharge circuit is disconnected at input voltage (the high level voltage VGH that high level voltage input terminal 18 inputs)
After electricity, it can be discharged by charge-discharge modules 13 and carry out voltage output, so that accessing other circuits provides short-duration power, draw high institute
Access the voltage of the corresponding port of circuit.
With reference to Fig. 2, the circuit diagram of present invention shutdown discharge circuit first embodiment.The shutdown discharge circuit 10 includes:
Switch control module 12, charge-discharge modules 13 and switching tube 14.
In the present embodiment, the switch control module 12 includes a diode D1；The anode conduct of the diode D1
The first end of the switch control module 12 is electrically connected to the input terminal 11 of the shutdown discharge circuit 10；And its cathode conduct
The second end of the switch control module 12 is electrically connected the first end and the switching tube 14 of the charge-discharge modules 13
Input terminal.Using the one-way conduction characteristic of diode, so that the diode D1 is led when anode voltage is greater than cathode voltage
It is logical, end when anode voltage is less than cathode voltage.
In the present embodiment, the charge-discharge modules 13 include a capacitor C1 (10U50V)；The capacitor C1's is upper
First end of the pole plate as the charge-discharge modules 13 is electrically connected the second end of the switch control module 12 and described
The input terminal of switching tube 14；Second end of the bottom crown of the capacitor C1 as the charge-discharge modules 13, ground connection.Other
In embodiment, the charge-discharge modules 13 include that can also pass through digital circuit.
In the present embodiment, the switching tube 14 includes a PMOS tube M1；The grid g of the PMOS tube M1 is opened described in being used as
The control terminal for closing pipe 14 is electrically connected to the input terminal 11 of the shutdown discharge circuit 10；The source electrode s of the PMOS tube M1 is as institute
The input terminal for stating switching tube 14 is electrically connected the second end and the charge-discharge modules 13 of the switch control module 12
Second end；Output end of the drain electrode d of the PMOS tube M1 as the switching tube 14, namely as the shutdown discharge circuit 10
Output end 15.In other embodiments, the switching tube 14 can be by one in PMOS tube, NMOS tube, triode, thyristor
A or multiple compositions.
As the 18 putting high level voltage VGH of high level voltage input terminal, the diode D1 conducting；The capacitor
The first end of device C1 receives the high level voltage VGH by the diode D1 and charges, and charging voltage is equal to the height
Level voltage VGH；The source electrode s voltage of the PMOS tube M1 is identical as its grid g voltage, so cut-off；To which the shutdown is put
The output end 15 of circuit 10 does not have voltage output.
When the high level voltage input terminal 18 stops putting high level voltage VGH, the diode D1 cut-off is described
The first end of capacitor C1 is discharged to the source electrode s of the PMOS tube M1, and the source electrode s voltage of the PMOS tube M1 is greater than its grid
Pole g voltage, so conducting, output end voltage is the high level voltage VGH；To the output of the shutdown discharge circuit 10
The 15 output high level voltage VGH of end, accesses other circuits and provides short-duration power, draw high the corresponding port of accessed circuit
Voltage.
With reference to Fig. 3, the architecture diagram of present invention shutdown discharge circuit second embodiment.The shutdown discharge circuit 10 includes:
Switch control module 12, charge-discharge modules 13, the first current limliting module 31, the second current limliting module 32, third current limliting module 33 and
Switching tube 14.
The input terminal 11 of the shutdown discharge circuit 10 is electrically connected to high level voltage input terminal 18；The first current limliting mould
The first end of block 31 is electrically connected to the input terminal 11 of the shutdown discharge circuit 10, and its second end is electrically connected the third
The first end of the first end of current limliting module 33 and the switch control module 12.The second end of the switch control module 12 point
It is not electrically connected the first end of the charge-discharge modules 13 and the first end of the second current limliting module 32.The charge-discharge modules
13 second end is grounded (GND).The second end of the second current limliting module 32 is electrically connected to the first end of the switching tube 14.Institute
The second end for stating third current limliting module 33 is electrically connected to the control terminal of the switching tube 14.The second end conduct of the switching tube 14
The output end 15 of the shutdown discharge circuit 10.The first current limliting module 31 is used to flow the high level voltage input terminal 18
Electric current out carries out current limliting, prevents transient high-current from flowing into the switch control module 12；The second current limliting module 32 is used for
Current limliting is carried out to the electric current of the second end outflow of the charge-discharge modules 13, prevents the output end 15 of the shutdown discharge circuit 10
Export high current；The electric current that the third current limliting module 33 is used to flow out the high level voltage input terminal 18 carries out current limliting
(or current limliting is carried out to the electric current by flowing out after the first current limliting module 31), to protect the switching tube 14.
Wherein, the first current limliting module 31, the second current limliting module 32 and third current limliting module 33 are selectable unit (SU), attached drawing
In illustrated with dashed box.For example, when not set first current limliting module 31 in circuit, the first end of the third current limliting module 33 with
And the first end of the switch control module 12 is directly electrically connected the input terminal 11 of the shutdown discharge circuit 10.When in circuit
When not set second current limliting module 32, the input terminal end of the switching tube 14 is directly electrically coupled to the switch control module 12
The second end of second end and the charge-discharge modules 13.When third current limliting module 33 not set in circuit, first limit
The second end of flow module 31 is directly electrically connected the control terminal of the switching tube 14 and is electrically connected to the switch control module 12
First end.
As the 18 putting high level voltage VGH of high level voltage input terminal, the switch control module 12 is connected, institute
The cut-off of switching tube 14 is stated, the first end of the charge-discharge modules 13 receives the high level electricity by the switch control module 12
Pressure VGH charges.When the switch control module 12 is connected, the first end of the charge-discharge modules 13 is controlled by the switch
Molding block 12 and the first current limliting module 31 receive the high level voltage VGH and charge, and charging voltage is equal to described
High level voltage VGH；The third current limliting module 33 is for protecting the switching tube 14, the input terminal voltage of the switching tube 14
It is identical as its control terminal voltage, so cut-off；To which the output end 15 of the shutdown discharge circuit 10 does not have voltage output.
When the high level voltage input terminal 18 stops putting high level voltage VGH, the switch control module 12 is cut
Only, the first end of the charge-discharge modules 13 is put by the second current limliting module 32 to the input terminal of the switching tube 14
Electricity, the switching tube 14 are connected, so that the output end 15 of the shutdown discharge circuit 10 exports the high level voltage VGH.Institute
When stating the cut-off of switch control module 12, the first end of the charge-discharge modules 13 is opened by the second current limliting module 32 to described
The input terminal for closing pipe 14 discharges, and discharge voltage is equal to the high level voltage VGH；The third current limliting module 33 is for protecting
The switching tube 14 is protected, the input terminal voltage of the switching tube 14 is greater than its control terminal voltage, so conducting, output end voltage
For the high level voltage VGH；To which the output end 15 of the shutdown discharge circuit 10 exports the high level voltage VGH, connect
Enter other circuits and short-duration power is provided, draws high the voltage of the corresponding port of accessed circuit.The second current limliting module 32 is used for
Current limliting is carried out to the electric current of the second end outflow of the charge-discharge modules 13, prevents the output end 15 of the shutdown discharge circuit 10
Export high current.
Present invention shutdown discharge circuit is disconnected at input voltage (the high level voltage VGH that high level voltage input terminal 18 inputs)
After electricity, it can be discharged by charge-discharge modules 13 and carry out voltage output, so that accessing other circuits provides short-duration power, draw high institute
Access the voltage of the corresponding port of circuit.
With reference to Fig. 4, the circuit diagram of present invention shutdown discharge circuit second embodiment.The shutdown discharge circuit 10 includes:
Switch control module 12, charge-discharge modules 13, the first current limliting module 31, the second current limliting module 32, third current limliting module 33 and
Switching tube 14.Wherein, the first current limliting module 31, the second current limliting module 32 and third current limliting module 33 are selectable unit (SU), attached
Illustrated in figure with dashed box.
In the present embodiment, the first current limliting module 31 includes a first resistor R1, and the second current limliting module 32 is wrapped
A second resistance R2 is included, the third current limliting module 33 includes a 3rd resistor R3.Preferably, the resistance value of the 3rd resistor R3
Greater than the resistance value of the second resistance R2, the resistance value of the second resistance R2 is greater than the resistance value of the first resistor R1.For example, institute
The resistance value for stating 3rd resistor R3 is 10K ohm, and the resistance value of the second resistance R2 is 1K ohm, the resistance value of the first resistor R1
It is 50 ohm.
In the present embodiment, the switch control module 12 includes a diode D1；The anode conduct of the diode D1
The first end of the switch control module 12 is electrically connected to the second end of the first resistor R1；And it is opened described in the conduct of its cathode
The second end for closing control module 12, be electrically connected the charge-discharge modules 13 first end and the second resistance R2 the
One end.Using the one-way conduction characteristic of diode, so that the diode D1 is connected when anode voltage is greater than cathode voltage,
Anode voltage ends when being less than cathode voltage.
In the present embodiment, the charge-discharge modules 13 include a capacitor C1；The top crown conduct of the capacitor C1
The first end of the charge-discharge modules 13 is electrically connected the second end and the second resistance of the switch control module 12
The first end of R2；Second end of the bottom crown of the capacitor C1 as the charge-discharge modules 13, ground connection.In other embodiments
In, the charge-discharge modules 13 include that can also pass through digital circuit.
In the present embodiment, the switching tube 14 includes a PMOS tube M1；The grid g of the PMOS tube M1 is opened described in being used as
The control terminal for closing pipe 14, is electrically connected to the second end of the 3rd resistor R3；The source electrode s of the PMOS tube M1 is as the switch
The input terminal of pipe 14 is electrically connected the second end of the second resistance R2；The drain electrode d of the PMOS tube M1 is as the switching tube 14
Output end, namely as it is described shutdown discharge circuit 10 output end 15.In other embodiments, the switching tube 14 can be with
It is made of one or more in PMOS tube, NMOS tube, triode, thyristor.
As the 18 putting high level voltage VGH of high level voltage input terminal, high level voltage VGH passes through first resistor
R1 (preventing high current) is exported to the diode D1, the diode D1 conducting；The first end of the capacitor C1 passes through institute
It states the diode D1 and first resistor R1 reception high level voltage VGH to charge, charging voltage is equal to the height
Level voltage VGH；The high level voltage VGH is by the first resistor R1 and the 3rd resistor R3 (for PMOS
Pipe M1 is protected) it exports to the source electrode s voltage and its grid g voltage phase of the grid g, the PMOS tube M1 of the PMOS tube M1
Together, so ending；To which the output end 15 of the shutdown discharge circuit 10 does not have voltage output.
When the high level voltage input terminal 18 stops putting high level voltage VGH, the diode D1 cut-off is described
By the second resistance R2, (electric current for flowing out to capacitor C1 carries out current limliting to the first end of capacitor C1, prevents described
The output end 15 of shutdown discharge circuit 10 exports high current) the source electrode s of Xiang Suoshu PMOS tube M1 discharges, the PMOS tube M1
Source electrode s voltage be greater than its grid g voltage, so conducting, output end voltage be the high level voltage VGH；To described
The output end 15 of shutdown discharge circuit 10 exports the high level voltage VGH, accesses other circuits and provides short-duration power, draws high institute
Access the voltage of the corresponding port of circuit.
The present invention also provides a kind of liquid crystal display device, the liquid crystal display device is using any of the above-described implementation of the present invention
Shutdown discharge circuit described in example；The high level voltage of the input terminal and the liquid crystal display device of the shutdown discharge circuit is defeated
Enter end electrical connection；Thin film transistor (TFT) in the output end of the shutdown discharge circuit and the pixel unit of the liquid crystal display device
Any one in one clock signal input terminal of the gate drivers of grid signal input terminal and the liquid crystal display device
Corresponding electrical connection.
With reference to Fig. 5, the architecture diagram of one embodiment of liquid crystal display device of the present invention.The liquid crystal display device includes high level
The grid signal input terminal 19 of thin film transistor (TFT) and shutdown discharge circuit 10 in voltage input end 18, pixel unit；The pass
Machine discharge circuit 10 includes: switch control module 12, charge-discharge modules 13, the first current limliting module 31, the second current limliting module 32,
Three current limliting modules 33 and switching tube 14.
The input terminal 11 of the shutdown discharge circuit 10 is electrically connected with the high level voltage input terminal 18；The shutdown is put
The output end 15 of circuit 10 is electrically connected with grid (gate) signal input part 19 of thin film transistor (TFT) in the pixel unit.?
In other embodiments, the output end 15 of the shutdown discharge circuit 10 can also be with the gate drivers of the liquid crystal display device
A clock signal (CK) input terminal electrical connection.
The first end of the first current limliting module 31 is electrically connected to the input terminal 11 of the shutdown discharge circuit 10, and its
Two ends are electrically connected the first end of the third current limliting module 33 and the first end of the switch control module 12.It is described to open
The second end for closing control module 12 is electrically connected the first end and the second current limliting module 32 of the charge-discharge modules 13
First end.The second end of the charge-discharge modules 13 is grounded (GND).The second end of the second current limliting module 32 is electrically connected to
The first end of the switching tube 14.The second end of the third current limliting module 33 is electrically connected to the control terminal of the switching tube 14.
Output end 15 of the second end of the switching tube 14 as the shutdown discharge circuit 10.The first current limliting module 31 for pair
The electric current that the high level voltage input terminal 18 flows out carries out current limliting, prevents transient high-current from flowing into the switch control module
12；The electric current that the second current limliting module 32 is used for the second end outflow to the charge-discharge modules 13 carries out current limliting, prevents institute
The output end 15 for stating shutdown discharge circuit 10 exports the film crystalline substance that high current damage is electrically connected with the grid signal input terminal 19
Body pipe；The electric current that the third current limliting module 33 is used to flow out the high level voltage input terminal 18 carries out current limliting (or to leading to
Cross the electric current flowed out after the first current limliting module 31 and carry out current limliting), to protect the switching tube 14.Physical circuit can refer to figure
Shown in 4, details are not described herein again.
Wherein, the first current limliting module 31, the second current limliting module 32 and third current limliting module 33 are selectable unit (SU), attached drawing
In illustrated with dashed box.For example, when not set first current limliting module 31 in circuit, the first end of the third current limliting module 33 with
And the first end of the switch control module 12 is directly electrically connected the input terminal 11 of the shutdown discharge circuit 10.When in circuit
When not set second current limliting module 32, the input terminal end of the switching tube 14 is directly electrically coupled to the switch control module 12
The second end of second end and the charge-discharge modules 13.When third current limliting module 33 not set in circuit, first limit
The second end of flow module 31 is directly electrically connected the control terminal of the switching tube 14 and is electrically connected to the switch control module 12
First end.
After the liquid crystal display device, which is powered, to be started, the 18 putting high level voltage VGH of high level voltage input terminal,
The switch control module 12 is connected, and the switching tube 14 ends, and the first end of the charge-discharge modules 13 passes through the switch
Control module 12 receives the high level voltage VGH and charges.When the switch control module 12 is connected, the charge and discharge mould
The first end of block 13 receives the high level voltage VGH by the switch control module 12 and the first current limliting module 31
It charges, charging voltage is equal to the high level voltage VGH；The third current limliting module 33 is for protecting the switching tube
14, the input terminal voltage of the switching tube 14 is identical as its control terminal voltage, so cut-off；To the shutdown discharge circuit 10
Output end 15 do not have voltage output；The liquid crystal display device works normally.
After liquid crystal display device power-off, the high level voltage input terminal 18 stops putting high level voltage VGH,
The switch control module 12 ends, and the first end of the charge-discharge modules 13 is opened by the second current limliting module 32 to described
The input terminal for closing pipe 14 discharges, and the switching tube 14 is connected, so that the output end 15 of the shutdown discharge circuit 10 exports
The high level voltage VGH.When the switch control module 12 ends, the first ends of the charge-discharge modules 13 passes through described the
Two current limliting modules 32 are discharged to the input terminal of the switching tube 14, and discharge voltage is equal to the high level voltage VGH；It is described
For third current limliting module 33 for protecting the switching tube 14, the input terminal voltage of the switching tube 14 is greater than its control terminal voltage,
So conducting, output end voltage is the high level voltage VGH；To which the output end 15 of the shutdown discharge circuit 10 exports
The high level voltage VGH draws high the voltage of the grid signal input terminal 19 to the high level voltage VGH.The pixel
Thin film transistor (TFT) opens electric discharge in unit, so that liquid crystal display device is without power-off ghost shadow.The second current limliting module 32 is used
Current limliting is carried out in the electric current of the second end outflow to the charge-discharge modules 13, prevents the output end of the shutdown discharge circuit 10
15 output high currents damage the thin film transistor (TFT) being electrically connected with the grid signal input terminal 19.
Liquid crystal display device of the present invention after a loss of power, can carry out electricity by the charge-discharge modules electric discharge for the discharge circuit that shuts down
Pressure output, draws high the voltage of the grid signal input terminal of thin film transistor (TFT) in pixel unit to high level voltage, so that pixel list
Thin film transistor (TFT) opens electric discharge in member, so that liquid crystal display device is without power-off ghost shadow, caused by solving because of residual charge
Film flicker and the problem of influence the display effect of display；And shutdown discharge circuit structure is simple.
With reference to Fig. 6 A-6B, wherein Fig. 6 A is charge release schematic diagram after liquid crystal display device of the present invention power-off, and Fig. 6 B is existing
There is in technology charge release schematic diagram after liquid crystal display device power-off.
The liquid crystal display device of the present invention it can be seen from Fig. 6 A, when input voltage (VIN) (as shown in figure label 61) falls
After electricity, grid (gate) voltage (as shown in figure label 62) of thin film transistor (TFT) (TFT) is shut down electric discharge electricity in pixel unit
Again it draws high to high level voltage VGH (gate drive voltage that thin film transistor (TFT) can be opened) on road；After drawing high, film crystal
Grid (gate) voltage (as shown in figure label 62) of pipe is greater than its source electrode (source) voltage (as shown in figure label 63),
Thin film transistor (TFT) is opened, charge quick release, no power-off ghost shadow.Numbering in the drawing 64 is grid control signal (Gab).
And as a comparison, the liquid crystal display device in the prior art it can be seen from Fig. 6 B, when input voltage (VIN) (such as
Shown in figure label 61) after power down, grid (gate) voltage (such as figure label 62 of thin film transistor (TFT) (TFT) in pixel unit
It is shown) maintain -3V, thin film transistor (TFT) cut-off, charge can not quick release, have power-off ghost shadow.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of shutdown discharge circuit characterized by comprising switch control module, charge-discharge modules and switching tube；
The input terminal of the shutdown discharge circuit is electrically connected to high level voltage input terminal；
The first end of the switch control module is coupled to the input terminal of the shutdown discharge circuit, and its second end is electrically connected institute
It states the first end of charge-discharge modules while being coupled to the input terminal of the switching tube；
The second end of the charge-discharge modules is grounded；
The control terminal of the switching tube is coupled to the input terminal of the shutdown discharge circuit, and its output end is shorted to the shutdown
The output end of discharge circuit；
When the high level voltage input terminal putting high level voltage, the switch control module conducting, the switching tube is cut
Only, the first end of the charge-discharge modules receives the high level voltage by the switch control module and charges；
When the high level voltage input terminal stops putting high level voltage, the switch control module cut-off, the charge and discharge
The first end of electric module is discharged to the input terminal of the switching tube, the switching tube conducting, so that shutdown electric discharge electricity
The output end on road exports the high level voltage.
2. shutdown discharge circuit as described in claim 1, which is characterized in that the switch control module includes a diode；
First end of the anode of the diode as the switch control module, and its cathode as the switch control module
Two ends.
3. shutdown discharge circuit as described in claim 1, which is characterized in that the charge-discharge modules include a capacitor；Institute
First end of the top crown of capacitor as the charge-discharge modules is stated, the bottom crown of the capacitor is as the charge and discharge mould
The second end of block.
4. shutdown discharge circuit as described in claim 1, which is characterized in that the switching tube includes a PMOS tube；It is described
The grid of PMOS tube is as the control terminal of the switching tube, input terminal of the source electrode as the switching tube of the PMOS tube, institute
State output end of the drain electrode of PMOS tube as the switching tube.
5. shutdown discharge circuit as described in claim 1, which is characterized in that the shutdown discharge circuit further comprises first
Current limliting module；The first end of the first current limliting module is electrically connected to the input terminal of the shutdown discharge circuit, and its second end
It is coupled to the control terminal of the switching tube while being electrically connected to the first end of the switch control module.
6. shutdown discharge circuit as described in claim 1, which is characterized in that the shutdown discharge circuit further comprises second
Current limliting module；The first end of the second current limliting module is electrically connected the second end of the switch control module and described fills
The first end of discharge module, and its second end is electrically connected to the input terminal of the switching tube.
7. shutdown discharge circuit as claimed in claim 6, which is characterized in that the second current limliting module includes one second electricity
Resistance.
8. shutdown discharge circuit as described in claim 1, which is characterized in that the shutdown discharge circuit further comprises third
Current limliting module；The first end of the third current limliting module is coupled to the input terminal of the shutdown discharge circuit, and its second end
It is electrically connected to the control terminal of the switching tube.
9. shutdown discharge circuit as claimed in claim 8, which is characterized in that the third current limliting module includes third electricity
Resistance.
10. a kind of liquid crystal display device, which is characterized in that the liquid crystal display device includes claim 1-9 any one institute
The shutdown discharge circuit stated；
The input terminal of the shutdown discharge circuit is electrically connected with the high level voltage input terminal of the liquid crystal display device；
The grid of thin film transistor (TFT) is believed in the output end of the shutdown discharge circuit and the pixel unit of the liquid crystal display device
Any one in one clock signal input terminal of the gate drivers of number input terminal and the liquid crystal display device corresponds to electricity
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811537826.6A CN109584819A (en) | 2018-12-15 | 2018-12-15 | A kind of shutdown discharge circuit and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811537826.6A CN109584819A (en) | 2018-12-15 | 2018-12-15 | A kind of shutdown discharge circuit and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109584819A true CN109584819A (en) | 2019-04-05 |
Family
ID=65930267
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811537826.6A Pending CN109584819A (en) | 2018-12-15 | 2018-12-15 | A kind of shutdown discharge circuit and liquid crystal display device |
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| Country | Link |
|---|---|
| CN (1) | CN109584819A (en) |
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| CN110400531A (en) * | 2019-07-29 | 2019-11-01 | 昆山龙腾光电有限公司 | A kind of neutralizing circuit and display panel |
| CN115312011A (en) * | 2022-04-26 | 2022-11-08 | 友达光电股份有限公司 | Pixel circuit and power supply method of shutdown power supply sequence thereof |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Applicant before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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Application publication date: 20190405 |